Straining and bleeding, if the stool is red, may be caused by the consumption of red heart dragon fruit, animal blood products, oral phenolphthalein preparations, etc., at this time is not real stool bleeding. But also consider diluted bleeding is a situation where real blood in the stool occurs, mostly from lesions in the digestive tract, including the following, which should be identified: I. Anal diseases: 1. Internal hemorrhoids: blood in the stool is a typical symptom of internal hemorrhoids, and there is bleeding at the end of defecation. The blood is usually bright in color and clearly visible, not accompanied by pain and a feeling of urgency, and the bleeding may increase when the stool is dry; 2. Anal fissure: anal bleeding with pain during defecation, not much bleeding, and bright in color. Young people are relatively more frequent, often together with dry stools or constipation, and inspection of the anus can reveal fissure damage; 3, anal fistula: most of them are the sequelae of perianal and rectal abscesses, which will repeatedly break down in the anus, perianal or rectum, bleeding pus and blood, bleeding not much, and slow healing of the wound. The first of these is the “mucus and blood stool”, which is often accompanied by pain in the lower abdomen, the pain will be relieved after the stool, the amount of bleeding is not much, the inflammation involving the rectum will have the symptoms of urgency; 2, amoebic colitis: the stool is mucus and blood, jam-like accompanied by fatigue, fever, emaciation, anemia and other toxic symptoms. Third, small intestinal diseases: 1, acute hemorrhagic necrotizing enterocolitis: mostly seen in children and adolescents, manifested by sudden abdominal pain, diarrhea, blood in the stool and toxemia, the presence of dark red or bright red paste-like stool, with a special fishy smell; 2, intestinal entrapment: common in children, the general symptoms are abdominal pain, vomiting and jam-like blood stool.